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Date:   Fri, 22 Mar 2019 15:09:22 +0100
From:   Arnd Bergmann <>
To:     Jonathan Cameron <>
        Nick Desaulniers <>,
        Nathan Chancellor <>,
        Arnd Bergmann <>,
        Hartmut Knaack <>,
        Lars-Peter Clausen <>,
        Peter Meerwald-Stadler <>,,
Subject: [PATCH] iio: ssp_sensors: avoid uninitialized variable usage

clang points out that 'calculated_time' is only sometimes
initialized here, which leads to incorrect data being
passed into another function:

drivers/iio/common/ssp_sensors/ssp_iio.c:95:6: error: variable 'calculated_time' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
        if (indio_dev->scan_timestamp) {
drivers/iio/common/ssp_sensors/ssp_iio.c:102:9: note: uninitialized use occurs here
drivers/iio/common/ssp_sensors/ssp_iio.c:95:2: note: remove the 'if' if its condition is always true
        if (indio_dev->scan_timestamp) {
drivers/iio/common/ssp_sensors/ssp_iio.c:84:25: note: initialize the variable 'calculated_time' to silence this warning
        int64_t calculated_time;
The data is subsequently ignored by iio_push_to_buffers_with_timestamp(),
but the warning still feels legitimate and to work around it, we can
initialize the time in the other case.

Signed-off-by: Arnd Bergmann <>
 drivers/iio/common/ssp_sensors/ssp_iio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/common/ssp_sensors/ssp_iio.c b/drivers/iio/common/ssp_sensors/ssp_iio.c
index 645f2e3975db..81e8f4844c90 100644
--- a/drivers/iio/common/ssp_sensors/ssp_iio.c
+++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
@@ -96,6 +96,8 @@ int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
 		memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
 		calculated_time =
 			timestamp + (int64_t)le32_to_cpu(time) * 1000000;
+	} else {
+		calculated_time = 0;
 	return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,

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